Rock-drilling machine

ABSTRACT

A rock-drilling machine comprising three main units is disclosed. The hammer device and the rotary drive motor are separately mounted on the slide, which incorporates a power transmission between the rotary drive motor and the drillsleeve.

[ Oct. 29, 1974 [56] References Cited UNITED STATES PATENTS l l RQCK-DRILUNG MACHINE [76] Inventors: Birger Zettergren, 6 Langsjovagen,

00 Nacka, Sweden; Hans 2,142,529 1/1939 Smith, 173/105 Hialmar g deceased, late o 3,157,237 ll/l964 173/105 54 Lovasvagen, 191 45 Sollentuna, 3,601,205 8/1971 l73/l05 Sweden by Ella Anita Ahlgren,

administratrix; Elsa Margareta Cederlund, administratrix, 1 18 Primary Examiner-Frank L. Abbott Assistant Examiner-William F. Pate, Ill

Millakersgatan, 792 00 Mora, Sweden [57] ABSTRACT A rock-drilling machine comprising three main units is [22] Filed: Mar. 1, 1973 2 App] 337 disclosed. The hammer device and the rotary drive 'motor are separately mounted on the slide, which in- [30] Foreign Application Priority Data Mar. l() 1972 corporates a power transmission between the rotary drive motor and the drill-sleeve.

Sweden........................t

ROCK-DRILLING MACHINE The present invention concerns a device at rockdrilling machines of that kind which comprises a separate rotary drive motor for rotating the drill-rod, a hammer device for impacting the drill-rod and a slide for guiding the hammer device along a feedbeam. The device according to the invention is mainly characterized thereby that the slide is made as a unit which is separate from the hammer device and including a power transmission between the rotary drive motor and the drillrod.

According to an advantageous embodiment of the invention the rotary drive motor is also made as a unit mounted on the slide separate from the hammer device.

According to a further advantageous embodiment the major part of the hammer device is covered by a muffling cover under which the exhaust air is admitted from the rotary drive motor for attenuating its exhaust sound. This advantageous embodiment is made possible by mounting the rotary drive motor behind the hammer device. By providing the bars on the slide on which the hammer device rests with recesses for letting out exhaust air from the hammer device and the rotary drive motor the advantage is achieved too that the bars are blown clean from unwanted particles and lubricated by the oil coming with the air, through which an essential increase of the life-time of the bars is achieved.

The present invention makes an effective sound deadening of the rock-drilling machine possible without unacceptably increasing its radial dimensions. Furthermore, servicing of the machine is made easier since the device does not have to be totally dismounted for service of the hammer device or the rotary drive motor.

One embodiment of the invention is described below with reference to the accompanying drawing on which FIG. Ia shows the front part of a rock-drilling ma chine from the side and partly in section.

FIG. 1b. which is a continuation of FIG. la, shows the rear part of the rock-drilling machine from the side and partly in section.

FIG. 2 shows the rock-drilling machine from the rear partly in section whereby some parts have been excluded.

FIG. 3 shows the rotary drive motor from above in section.

FIG. 4 shows the functional build-up of the rotary drive motor.

FIG. 5 is a part view, corresponding to FIG. Ia, where the hammer device is not entirely mounted on the slide.

FIG. 6 is a view in the direction 66 according to a bearing for a shaft is placed in the sleeve 27. A

shaft 25 is at its other end provided with ridges which together with slots in a gear 31 form a coupling 32. The gear 31 is through bearings 33, 34 journalled in the rear piece 29 and the end plate 30. Holes have been provided in the rear piece 29 and the end plate 30 through which a nipple 54 on the hammer device 1 extends. A seal between the nipple 54 and the end plate 30 is achieved by means of a sealing ring 36. Through a compressed air inlet 35 on the end plate 30 compressed air can be supplied to the hammer device 1 from a compressor or some other compressed air source. The rear piece 29 is furthermore provided with a nut 37 for a fragmentary shown feedscrew 15.

The hammer device ll consists of a housing 52 for a hammer mechanism into which the nipple 54 is screwed, a transmission gear housing 51 and a journal box 53. The housing 52 for the hammer mechanism incorporates a hammer mechanism of which only the front part of the hammer piston 62 is shown, the principle of which is well-known to the professional man. A driver part 57 is through bearings 58, 59 journalled in the transmission gear housing 51 and the journal box 53. The driver part 57 is provided with teeth for cooperation with teeth 28 on the shaft 25. The driver part 57 is furthermore internally provided with slots 64 for cooperation with ridges 63 on a shank adapter 60. The shank adapter 60 cooperates in the usual way with a drill-rod. The shank adapter 60 is journalled in a bushing 61 and a further not shown bushing. The hammer device is kept together by two longitudinal screws 55 and nuts 56. The hammer device 1 is furthermore provided with shoes 65, 66 which rest on the bars 22, 23 of the slide 3. When the hammer device 1 has been pushed on to its rearmost position on the slide 3, in which the nipple 54 takes the position shown in FIG. 1b, the hammer device 1 is connected to the slide 3 through long screws 10, 11 (see FIGS. 2 and 6). In FIG. 5 the relative position which the hammer device 1, the transmission gear housing 51 and the shaft 25 take before the hammer device I is entirely mounted on the slide 3. A muffling cover 5 is through screws 12, 13 connected to the bars 22, 23 of the slide 3. The muffling cover 5 rests through a seal 6 on the transmission gear housing 51 and through a seal 7 on the rear piece 29. The seals 6, 7 are secured to the muffling cover 5 by means of metal strips 8, 9 which are fixed to the muffling cover 5 by means of welding or in another suitable manner.

The rotary drive motor 2 consists of a motor housing 72, a front end plate 71, a rear end plate 73 and a lid 74. The rotary drive motor 2 is furthermore provided with two nipples 75, 76 through which compressed air is supplied to or conducted away from therotary drive motor 2. In the rotary drive motor 2 three gears 77, 78, 79 are journalled in bearings 89, 90, 87, 88, 91, 92. The gear 79 turns freely around a sleeve 93. The gear 77 is provided with a stud 95 on which a gear 94 ismounted. The gear 94 is secured to the stud 95 by means of a key 97 and is kept in position by nuts 96.. The gear 94 cooperates with teeth 83 on a sleeve-like device 82. The sleeve-like device 82 is mounted on a shaft so that these together constitute an output shaft. The sleevelike device 82 is kept in position onthe shaft 80 by nuts 84. The output device 80, 82 is journalled in bearings 85, 86. The gear 78 turns freely around the sleeve-like device 82. The shaft 80 is provided with teeth 81 for cooperation with gear 31.

Compressed air is at drilling supplied through the nipple 75 to the inlet channel 44. Through this the gears 77, 78, 79 are given the direction of rotation marked by the arrows A. B. The exhaust channel 45 is in connection with the nipple 76. The air from the exhaust channel 46 and the venting channels 41, 42, 43 is conducted through the rear piece 29 and the end plate 30 in under the muffling cover 5 which is marked by the line of dashes 42 in FIG. 2. This air is let out through recesses 38 in the bars 22, 23. Through this unwanted particles are blown away from the bars 22, 23. The bars are furthermore lubricated because the air contains oil. Partly expanded air is conducted through channels 48, 49 from the first motor stage, which comprises the gears 77, 78, to the inlet channel 50 of the second motor stage. The rotary drive motor 2 is furthermore provided with a restricted channel 47 which connects the inlet channel 44 to the inlet channel 50. The restricted channel 47 is restricted either along a part of its length or along all of its length. The restricted channel 47 serves the purpose of supplying the inlet channel 50 with air of full working pressure at low numbers of revolution when the air consumption of the rotary drive motor 2 is low. This results therein that the output torque of the rotary drive motor 2 becomes essentially higher at low numbers of revolution than at normal numbers of revolution. At normal numbers of revolution the air consumption of the rotary drive motor 2 is so high that an essential loss of pressure is achieved in the restricted channel 47 through which the influence of this channel becomes unimportant. At reversal of the rotary drive motor 2 compressed air is supplied through the nipple 76.

The above described and on the drawing shown embodiment of the invention is only an example which can be modified within the scope of the subsequent claims.

What we claim is:

l. A device at rock-drilling machines comprising a pressure-fluid-driven hammer device for impacting a drill-rod, a pressure-fluid-driven rotary drive motor, situated behind the hammer device, for rotating the drillrod via a drill-sleeve associated with the hammer device at the front end thereof and a slide for guiding the hammer device along a feed-beam said slide being made as a unit which is separable from the hammer device said slide member containing a power transmission having an input end which cooperates with an output shaft of the rotary drive motor and an output end which cooperates with the drill-sleeve.

2. A device according to claim 1 in which said rotary drive motor is made as a unit which is separate from the hammer device and mounted on the slide.

3. A device according to claim 1 comprising a muffling cover which covers the major part of the hammer device and is connected to the slide.

4. A device according to claim 3 in which said rotary drive motor is mounted on an end plate which constitutes a part of the slide and comprises at least one channel for conducting exhaust air from the rotary drive motor in under the muffling cover.

5. A device according to claim 4 in which said slide comprises a plate and two bars which are connected to the plate and provided with recesses which connect the space under the muffling cover to the surrounding atmosphere.

6. A device according to claim 1 in which said hammer device comprises a nipple or a recess which is brought into cooperation with a recess or a nipple on the slide, through which the hammer device is connected to a pressure-fluid source, when the hammer device is slid on along the slide. 

1. A device at rock-drilling machines comprising a pressurefluid-driven hammer device for impacting a drill-rod, a pressurefluid-driven rotary drive motor, situated behind the hammer device, for rotating the drill-rod via a drill-sleeve associated with the hammer device at the front end thereof and a slide for guiding the hammer device along a feed-beam said slide being made as a unit which is separable from the hammer device said slide member containing a power transmission having an input end which cooperates with an output shaft of the rotary drive motor and an output end which cooperates with the drill-sleeve.
 2. A device according to claim 1 in which said rotary drive motor is made as a unit which is separate from the hammer device and mounted on the slide.
 3. A device according to claim 1 comprising a muffling cover which covers the major part of the hammer device and is connected to the slide.
 4. A device according to claim 3 in which said rotary drive motor is mounted on an end plate which constitutes a part of the slide and comprises at least one channel for conducting exhaust air from the rotary drive motor in under the muffling cover.
 5. A device according to claim 4 in which said slide comprises a plate and two bars which are connected to the plate and provided with recesses which connect the space under the muffling cover to the surrounding atmosphere.
 6. A device according to claim 1 in which said hammer device comprises a nipple or a recess which is brought into cooperation with a recess or a nipple on the slide, through which the hammer device is connected to a pressure-fluid source, when the hammer device is slid on along the slide. 